<LinearLayout
            android:id="@+id/left_big_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
           android:orientation="vertical"
             android:background="#FF00FFFF"
            >
             <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:text="Quick Menu"
                 android:textColor="@color/black"
                 android:textStyle="bold"
                 android:padding="10dp"
                 android:textSize="20sp"
                 android:id="@+id/tv_menu_title"/>


             <!-- The navigation menu -->

        <ExpandableListView
            android:id="@+id/lvExp"
            android:layout_width="match_parent"
            android:dividerHeight="1dp"

            android:transcriptMode="alwaysScroll"
            android:listSelector="@drawable/category_listselector"
            android:divider="@color/black"
            android:layout_height="match_parent"
            android:layout_gravity="left"
            android:background="#E6E6E6" >

        </ExpandableListView>
    </LinearLayout>

@Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {


        LayoutInflater inflater = LayoutInflater.from(_context);

            convertView =inflater.inflate( R.layout.list_group,parent, false);

        String headerTitle = (String) getGroup(groupPosition);

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

@Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        final String childText = (String) getChild(groupPosition, childPosition);

        LayoutInflater inflater = LayoutInflater.from(_context);
            convertView =inflater.inflate(R.layout.list_item,parent, false);


        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        LinearLayout childLayout= (LinearLayout) convertView.findViewById(R.id.expand_child_layout);
        return convertView;
    }